Exim mail delivery slow,

To elaborate , main shared IP is blacklisted and assigned a new IP to Exim mail server
Now ,the mails are delivered very slowly
What could be the reason ,
1.Will exim automatically update the SPF record for the New IP or we need to assign it separately under DNS Functions > edit DNS

Did the IP get blacklisted due to spamming from your server. So make sure there is a no email flood in queue. Run "exim -bpc" as root and see how many mails reiside in the queue. If the count shows a big number, that should be the primary issue and you should have to clear the spam / bounce / frozen emails from qeue. Find some useful exim commands at Exim Cheatsheet

Exim will not change ANY dns records if we change the mail interface IP; we have to do the necessary changes manually!